<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JS-引入方式</title>
    <!-- <script>
        alert("Hello JS");//定义弹出框
    </script> -->
</head>
<body>
    
    <!-- Modified for Lab1 scene1 R3 -->

    <!-- 内部脚本 -->
    <!-- <script>
        alert("Hello JS");//定义弹出框
    </script> -->
    
    <!-- 外部脚本 -->
    <script src="js/demo.js"></script>
</body>
</html>

<!-- <script>
    alert("Hello JS");//定义弹出框
</script> -->